8588A/8558A
Operators Manual
122
The sequence is:
At midnight on 5th October 2018 the trigger process leaves the Initiate layer and
passes (without a delay) through the ARM2 layer which is set at its defaults. As
the ARM1 source is Timer, the process continues down through the Arm1 event
detector starting the Arm1 Timer and incrementing the Arm1 layer loop counter
on the way.
The Trigger layer Timer starts as the process passes through the Trigger layer
Event detector. The trigger layer Loop counter is incremented and the first of the
reading acquisitions is triggered. The Trigger layer loop count (1) is less than
Count (50) so the upward process flow is diverted back through to the Trigger
layer Event detector. The process pauses at this point until the 30 second Timer
expires and another reading is triggered. This loop repeats until the Trigger layer
Loop counter equals Count (50) at which point the process flows up to the Arm1
layer.
Arm1 layer Loop Counter (1) equals Arm1 layer Count so the flow continues
upwards through Arm2 back to the initiate layer. The process so far has taken 50
x 30 = 1500 seconds = 25 minutes so the time is 2018:10:05:00:25:00. This is
less than the Epoch expiry so the process goes back down through Arm2 and
waits at the Arm1 Event detector until Arm1 Timer (3600 seconds) expires 35
minutes later at 2018:10:05:01:00:00. The process enters the Trigger layer to
begin the second group of 50 readings and the 3 day process continues.
At 2018:10:07:23:00:00 the Arm1 Timer expires at the start of the final circuit
around the Trigger subsystem. 25 minutes later the last group of 50 readings has
been gathered and the process flow returns to the Initiate layer. This time the
Epoch has expired so the system stops taking readings.
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